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Nebraska State Gemstone:

Blue agate bracelet - click to see all state gemstones
Charm bracelet with blue lace agate teardrops and ovals and chalcedony
rondells - photo by Complete Fragments on Flickr - noncommercial
use permitted with attribution / no derivative works.
See All Gem & Gemstone Symbols.

Blue Chalcedony (Blue Agate)

Nebraska designated blue chalcendony (commonly called blue agate) as the official state gemstone in 1967. Blue chalcedony is a pale stone which sometimes has a dark internal form with bands of blue and white and often has a colorless streak. Blue agate is often used to make jewelry.

Blue agate is found in northwestern Nebraska, where it formed in wind-blown silt and claystone deposited in the Chadron Formation of the Oligocene Age.

Source:
Nebraska's state symbols (PDF): Nebraska Legislature
Links:
All Geological Symbols

    

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appreciation for our natural treasures and cultural heritage.
 

Nebraska Symbols & Icons:

bird - mammal
fish - insect
flower - grass
tree - soil
fossil - gem
rock - river
motto

flag - seal
name - nickname
soft drink
beverage - quarter
song - ballad
dance - poet
baseball capitals
 

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Nebraska Gifts - Gifts by State